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std::chrono...day_indexed(3)  C++ Standard Libary std::chrono...day_indexed(3)

NAME
       std::chrono::weekday_indexed - std::chrono::weekday_indexed

Synopsis
	  Defined in header <chrono>
	  class	weekday_indexed;      (since C++20)

	  The  class weekday_indexed combines a	weekday, representing a	day of
       the week	in the
	  Gregorian calendar, with a small index n in the  range  [1,  5].  It
       represents the
	  first, second, third,	fourth,	or fifth weekday of some month.

	  weekday_indexed is a TriviallyCopyable StandardLayoutType.

Member functions
	  constructor	constructs a weekday_indexed
			(public	member function)
	  weekday	access the stored weekday
			(public	member function)
	  index		access the stored index
			(public	member function)
	  ok		checks if the weekday and index	are both valid
			(public	member function)

	 Nonmember functions

	  operator== compares two weekday_indexed values
	  (C++20)    (function)
	  operator<< outputs a weekday_indexed into a stream
	  (C++20)    (function template)

Helper classes
						       specialization	    of
       std::formatter that
	  std::formatter<std::chrono::weekday_indexed> formats	a  weekday_in-
       dexed according to
	  (C++20)				       the provided format
						       (class	template  spe-
       cialization)

Example
       // Run this code

	#include <iostream>
	#include <chrono>

	int main()
	{
	    using namespace std::chrono;

	    constexpr weekday_indexed wi = Friday[2];

	    // Indexed weekday can be used at any place	where chrono::day  can
       be used:
	    constexpr year_month_weekday ymwd =	 2021y / August	/ wi;
	    static_assert( ymwd	== August / wi / 2021y and
			   ymwd	== wi /	August / 2021y );
	    // std::cout << ymwd << '\n';

	    constexpr year_month_day ymd{ymwd};	// a conversion
	    static_assert(ymd == 2021y / 8 / 13);
	    // std::cout << ymd	<< '\n';
	}

Possible output:
	2021/Aug/Fri[2]
	2021-08-13

http://cppreference.com		  2022.07.31	  std::chrono...day_indexed(3)

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